Griffin, who signed a three-fight deal with the Nebraska based MMA promotion, is best known for his five year run in the UFC, which began in 2006. During that time, Griffin would earn wins over the likes of Clay Guida, Rafael dos Anjos and Manny Gamburyan before being cut from the organization late last year after going 1-4 in his last five bouts.

Currently training at Xtreme Couture in Las Vegas, Griffin is expected to return to the lightweight division following his brief stint at featherweight.

RFA also announced that it had signed Chris Holdsworth to a four-fight deal. Holdsworth, who is a Marc Laimon jiu-jitsu black belt, has won all nine of his bouts (three professional and six amateur) within the first round.

In 2011, Holdsworth joined Team Alpha Male where he is currently training alongside Urijah Faber, Chad Mendes, Joseph Benavidez, T.J. Dillashaw, Lance Palmer and Danny Castillo in preparation for his next bout.

Both Griffin and Holdsworth are expected to make their RFA debuts later this year.